When you know, you know!

Gwen Stefani should make sure her nails are perfectly manicured, because Blake Shelton is going to put a ring on it any day now, People reports. Although the country crooner hasn't popped the question just yet, all signs point to an imminent engagement.

"They are not engaged yet. Everyone is expecting it to happen at some point, though," a source dished to the mag.

The No Doubt songstress is currently on tour, which makes a spontaneous romantic proposal a little difficult.

"It seems the timing [for an engagement] just hasn't been right. But Gwen is very, very happy with Blake. She always acts giddy when she talks about Blake," the source added.

Their relationship has moved full-steam ahead since their respective divorces, and friends say that's because they're a match made in heaven. "Their relationship is almost too good to be true. They are very much alike and really have a very special relationship. All the things that need to work out for two people to merge lives have worked out," a Stefani insider gushed.

We have to admit that they're totally adorable together!